International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 03 Issue: 08 | Aug-2016
p-ISSN: 2395-0072
www.irjet.net
Comparative Study on Conventional Frame and Combined Model Frame under High Earthquake Zone Arvind Belkeri1, N.S.Inamdar2
1Post
Graduate Student in Structural Engineering, B.L.D.E.A’S College Vijayapura-562135, India 2 Assistant Professor, M.Tech Structural Engineering, B.L.D.E.A’S College Vijayapura
---------------------------------------------------------------------***--------------------------------------------------------------------1.1 OBJECTIVES
Abstract - In this study, 3D analytical model 12 storey
structure generated for basic model frame and combined model frame are evaluated by linear static (Response spectrum) and non-linear (Push over) analysis in high earthquake zone by structural analysis tool ETABS. From the linear static Response spectrum analysis it can be seen that displacement, storey drift, and time period are more in basic model as compared to combined model. The frequency and storey shear are more in combined model as compared to the basic model. From above studies it can also be seen that the nonlinear static pushover analysis shows formation of hinges at performance point in basic model frame are more that leads to quaking the structure and required retrofitting as compared with combined model frame, the combined model frame behaves much better in high earthquake as compared with basic model frame.
Key Words: Asymmetric building, Response spectrum analysis and Pushover analysis in ETABS.
1. INTRODUCTION
Earthquake disaster always one of the greatest natural calamities thrust upon mankind. Past earthquake has demonstrated that common buildings are highly vulnerable to strong seismic ground motion and typical design methods, lack basic resistance to earthquake forces. Urgent measure of seismic strengthing is required to upgrade seismically to huge stock of such existing building. A number of prescriptive techniques for retrofitting of such buildings are suggested by various interest groups, but a formal quantitative approach in necessary to this effort of retrofitting. The current study deals with the comparative study on basic model frame and combined model frame of 12 storey building which is situated in high earth quake zone (zone V). The response spectrum analysis and non-linear static push over analysis is carried out. The ETABS software is used to analysis and the results are compared. The comparative study includes the displacement, storey drift, frequency and time period, storey shear, from non linear push over analysis displacement, base shear and performance point. It is found that the basic model frame requires a retrofitting after the analysis (zone 5). The combined model doesn’t require a retrofitting.
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The objective of the current study is to compare combined model frame and basic model frame and comparing the behavior of model for analyzed results with the following objectives: This study is comprised of three phases, 1. Creation of 3D basic frame model and combined frame model (no. of story 12). 2. Analysis basic model frame and combined model frame by linear response spectrum analysis and non-linear static pushover analysis. 3. Study and compare the behavior of combined model frame and basic model frame for analyzed results.
2. BUILDING DESCRIPTION The asymmetric building plan is taken for the current study; a building is an ordinary moment resisting frame building. A 12 story RC frame building is taken for the analysis. The story height is 3m taken for all floors. The area of the plan is 30m X 24m. The total height of the structure is 36m. The building frame element is modeled in ETABS and it is classified as beam and concrete elements, slab is modeled as thin membrane. Table-1 Sectional details of basic model Model Story Column Beam Slab type 9 to 300X1000 230X600 200 12 Basic 5 to 8 300X1000 230X600 200 model B to 300X1000 230X600 200 4 Table -2: Sectional details of combined model Model Story Column Beam type 9 to 300X1200 230X600 12 Combined
Slab 200
5 to 8
300X1300
230X600
200
B to 4
300X1400
230X600
200
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